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King kln rs232 format

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squiggles

Joined: 05 Oct 2006
Posts: 6

Posted: Wed Apr 02, 2008 4:48 pm Post subject: King kln rs232 format

I have a kln 89b and have hooked the output serial( pin 2 ) up to a computer to read what sentences it is putting out and ground pin 4 on the serial cable is attached to pin 14 in the gps.  However, I have it set to 9600 n 8 1 and  any variations on 9600.  However, while I am able to to read some characters, most are unintelligible.  



Granted the unit and antenna are in the garage and unable to get a satellite lock, however I would not have expected junk characters to be output.



Any thoughts on how to set the serial port on the reading computer?



Thank You.

-Scott

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mmajors(at)ieee.org
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Posted: Wed Apr 02, 2008 5:31 pm Post subject: King kln rs232 format

Scott,



You've got the right pins and the right serial settings at 9600/N/8/1.  The 

KLN-89B doesn't output NMEA sentences or even the modern King/Aviation 

serial format that would be readable in hyperterminal.  Each sentence starts 

with a STX (ASCII 0x02) and ends with a ETX (ASCII 0x03) so you're going to 

see some ASCII 'unprintables' along with readable text.  There's not any 

carriage returns or line feeds either so it's probably running off the 

hyperterminal screen in funny ways too.  In summary, you're not going to be 

able to easily monitor the serial data out of the -89 on a PC dumb terminal, 

you'll have to write some software to parse the sentences.  If you're going 

to try that, find a King avionics dealer and copy the 5 pages out of the 

KLN89/89B install manual that define the serial data sentences.



Mike

---

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squiggles

Joined: 05 Oct 2006
Posts: 6

Posted: Wed Apr 02, 2008 6:04 pm Post subject: Re: King kln rs232 format

I knew the 89b was a particular beast with its rs232 sentence output, I just didn't realize it was that bad...*heavy sigh*...though I had hoped it was just noise on the data or the ground reference was just a bit off...



I have what I thought was a complete installation manual( part# 006-00748-0000 ), but it would seem I only have the pinouts and associated installation info.



Thanx for the info...



-Scott

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Thu Apr 03, 2008 12:59 pm Post subject: Re: King kln rs232 format

Scott,



It's not Bad, its Binary!

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